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Subject
- Geology77
- Administrative and political divisions49
- Census districts49
- Geochemical prospecting25
- Magnetic anomalies22
- Groundwater20
- Mines and mineral resources20
- Geomagnetism17
- Geology, Stratigraphic10
- Maps10
- World maps9
- Geology, Structural8
- Population6
- Engineering geology5
- History4
- Water quality4
- Copper ores3
- Faults (Geology)3
- Geophysics3
- Gravity3
